md: avoid dereferencing NULL pointer when accessing suspend_* sysfs attributes.

If we try to modify one of the md/ sysfs files
  suspend_lo or suspend_hi
when the array is not active, we dereference a NULL.
Protect against that.

Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 09be637..2166af8 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3573,7 +3573,8 @@ suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
        char *e;
        unsigned long long new = simple_strtoull(buf, &e, 10);
 
-       if (mddev->pers->quiesce == NULL)
+       if (mddev->pers == NULL || 
+           mddev->pers->quiesce == NULL)
                return -EINVAL;
        if (buf == e || (*e && *e != '\n'))
                return -EINVAL;
@@ -3601,7 +3602,8 @@ suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
        char *e;
        unsigned long long new = simple_strtoull(buf, &e, 10);
 
-       if (mddev->pers->quiesce == NULL)
+       if (mddev->pers == NULL ||
+           mddev->pers->quiesce == NULL)
                return -EINVAL;
        if (buf == e || (*e && *e != '\n'))
                return -EINVAL;